Talkd is the server that notifies a user that someone else
wants to initiate a conversation. It acts a repository of
invitations, responding to requests by clients wishing to
rendezvous to hold a conversation. In normal operation, a
client, the caller, initiates a rendezvous by sending a
CTL_MSG to the server of type
LOOK_UP (see protocols/talkd.h).
This causes the server to search its invitation tables to
check if an invitation currently exists for the caller (to
speak to the callee specified in the mes- sage). If the
lookup fails, the caller then sends an
ANNOUNCE message causing the server to
broadcast an announcement on the callee's login ports
requesting contact. When the callee responds, the local
server uses the recorded invitation to respond with the
appropriate rendezvous address and the caller and callee
client programs establish a stream connection through which
the conversation takes place.
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